'Day of Atonement' may refer to:
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Yom Kippur, the Jewish Day of Atonement
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Day of Atonement (Nation of Islam), a national day established in 1995 by the Nation of Islam
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Investigative Judgment, the antitypical Day of Atonement according to
Seventh-day Adventist teaching.
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Day of Atonement (Christian holiday), a day of fasting kept by a minority of Christians on the same day as Yom Kippur
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Day of Atonement (play)'', a play by Samson Raphaelson
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Day of Atonement (novel)'', a novel by Jay Rayner